Respuesta :

Answer:

There should only be one chemical reaction, this is because toasting the bread is not only using heat, but you cannot untoast the bread, and also theres a reaction with the amino acids and sugar in bread when it's cooked. I hope this helps you! :)

Answer:

One

Explanation:

 One Chemical changes-It was when he toasted the bread. The heat changed the bread so that it has the crust on the outside

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